Caustic is an adjective, not a noun. It does not tell you caustic what. You might as well ask for the mass of a blue.
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You want 22 litres of the caustic in your 220. At present you have 4 in 100 so you add 18 of caustic and 102 of whatever the caustic is dissolved in.
530 percent 35 = 185.5530% of 35= 530% * 35= 5.3 * 35= 185.5
380 - 35 percent percent equals 2.47
35 percent = 0.35 or 35/100 or 7/20
35 percent of 360 is 126.